Zinc Phosphate Coating Services is applied when increased corrosion resistance is required. Zinc phosphate withstands 240 hours of neutral salt test.A wide range of coating weights may be obtained : from very thin fine crystal films to heavy deposits with weight up to 4 g/ft2 (40 g/m2).
The coating color is gray of different tins : from light to dark. Finer zinc phosphate crystals produce darker color. Dark gray color is also characteristic for the high carbon steel substrates.
Zinc phosphate coatings may be applied by using immersion or spray technique.
Light and medium weight zinc coatings do not require substrate surface activation. The substrate surface should be acid activated prior to heavy coating deposition. Zinc phosphate is used not only for non-coated Steels and cast irons but also for galvanized (zinc plated) steel parts.